Dating for conception
In a fertility practice, like ours, that scans early pregnancy frequently, we find this level of accuracy. There is no percentage implied, it doesn't work like that.
In my experience 1st trimester us can be accurate to within /-1 day under many circumstances, but you shouldn't count on it every time. Read more Depending on how your due date is determined there may be a large margin of error.
If it is a single measurement, it would be less accurate but still within a 4-5 day margin.
As always, depends on the skill of the ultrasonographer. Read more First trimester us is usually considered to be accurate within a week, or /- 3-4 days.
Based on that date you can make a guess as to who the father is, but it will only be a guess.
The accuracy increases with ultrasound dating so if you have had one that predicts the delivery date, I would go with the ultrasound! Read more If done by ultrasound and correlated two to three times in subsequent weeks, it is probably within 2days.The only way to be certain of paternity is to have a paternity test done.The Pregnancy Conception Calculator estimates the date of conception based on the expected due date of the pregnancy.Visit the calculator and see what date you get, then talk with your doctor.I broke up with my boyfriend last november and had unprotected sex with some else twice on the 14th and the 19th of december I then had a period on the 24th of december.
Typically standard deviation of error is /- 5 days. Read more Ultrasound dating is most accurate early in the pregnancy using the crown-rump length (crl) of the small fetus. You can confirm nearly every single piece of information about your pregnancy on the internet. Short of tracking ovulation with daily ultrasounds or one of the in vitro methods, that is the best we can do. Read more /-3-5 days by ultrasound before 10 weeks.